example.sass

#mashajs-nav {
	position: relative;
	height: 100%;
}

@media only screen and (max-width: 730px) {
	#mashajs-nav {
		display: none;
	}
}

#mashajs-nav .num {
	position: absolute;
	left: -13.5px;
	top: 50%;
	margin-top: -7.5px;
	font-size: 11px;
	line-height: 15px;
	width: 55px;
	text-align: center;
	color: #8C90A5;
	transition: opacity 0.5s ease-in-out;
}

#mashajs-up,
#mashajs-down {
	width: 26px;
	height: 26px;
	position: absolute;
	cursor: pointer;
	-webkit-appearance: none;
	-moz-appearance: none;
	border: 0;
	border-radius: 13px;
	background: transparent;
	background: url("./img/masha-nav-arrow.svg") no-repeat 0 0;
	background-size: 20px 24px;
	background-position: center 0;
	opacity: 1;
}

#mashajs-up:hover,
#mashajs-down:hover {
	background-image: url("./img/masha-nav-arrow-hover.svg");
}

#mashajs-down {
	bottom: 0;
	transform: rotate(180deg);
}

#mashajs-up {
	top: 0;
}

#mashajs-down.disabled,
#mashajs-up.disabled {
	cursor: default;
	opacity: 0.5;
	background-image: url("./img/masha-nav-arrow.svg");
}

#mashajs-nav-position {
	position: fixed;
	z-index: 100000;
	height: 62px;
	top: 50%;
	height: 90px;
	margin-top: -45px;
	bottom: 20px;
	width: 28px;
	left: 942px;
	display: block;
	opacity: 1;
	transition: opacity 0.5s ease-in-out;
}

#mashajs-nav-position.is-disabled {
	display: none;
	opacity: 0;
}

@media only screen and (max-width: 730px) {
	#mashajs-nav-position {
		display: none;
	}
}

#mashajs-nav-center {
	height: 100%;
	display: block;
	margin: auto;
	position: relative;
}